The picture was preferred with edging effect.
First of all, a weaker setting was applied with 85.0 Speed and 18 Power. However, the sheep picture was not clear enough. Therefore, the weaker setting was applied again, the wool fabric was done by laser cut in same setting twice totally.
The reason why does not adjust to a stronger setting for second time laser cut is preventing the setting will be too high to pass through the fabric and make the edging effect fail.
Finally, this laser cut for wool fabric was successful to end with a perfect picture sheep picture on it.
Suggestion for improvement:
A strong setting in Speed and Power is able to apply on wool fabric directly. (Strong setting means lower speed with bigger power)